Why quick book is too slow while uploading supporting as well as loading also taking lot of time?

Welcome to the Community forum, @mahesh-grubtech-.t. I can share some information about why your QuickBooks Online (QBO) account slow and how you can improve its overall performance.

QBO is a web-based accounting service. It relies on your computer or device’s processing power, the available memory (RAM), and your Internet connection speed.

To get the best experience possible when using QBO, I suggest checking if your operating system is up to date and meets the basic requirements to help narrow down the reason for slow performance: System Requirements for QuickBooks Online. 

To learn more about why your QuickBooks Online is running slow, check this article: Why is my QuickBooks Online slow?.

If you need additional assistance while managing your QuickBooks account, let me know. I'll be around to provide further assistance. Have a nice day.